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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee6293359220d384ea00b32404d7079106552a3b8f45efef06c0be9bed75ea16' 
  AND token = 'MPG0c39M8J5e0jLt0QxyQTnFMOPWE9reVbwwGmqqytg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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