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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f55bf560cf8448140f6c07ba17fa9cb304c384b7fe5ce979ff3537cf23443146' 
  AND token = 'eKM3SApEBe8LBLbv+Fk64IBDzykets/SkYmNBkri9Y8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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