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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a75620aef678eb13533a60e7287e9f11ce5eb7fcc326697ea65674999711d256' 
  AND token = '+Df7H3liRGcDD35QBMK99Y9kgXc8VOJyNN2jH/HvLMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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