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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74b40efd755f012c6b87016e44d066c3556197fd71156f21826c7bd9edb2d3cc' 
  AND token = '36Lmqf33JV3vSI2G1NELDnRYJXUz6F3XCtdzfvg9S+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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