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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54f066e4f0b9cbd10b2476c90a1c92ce2573f41dc000d684302ce82e8f4cefbb' 
  AND token = '6ES0lDO+8+ae2EAWgBQA9WxNpaUGeU5FKFlLg1FvUcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}