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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ab7a3f93b30ab07be04dd4dc33a66352eae56b0b7ee0d8e32912e9cdf1ac11f' 
  AND token = 'uxY4T9UUkvTJrXBMddT2nIMdZNCty8NPOcJHx9gZ6BE=' 
  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"
    }
  }
}