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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd5b4d9979fd930c93bf9e053b45658178acfa7f15b9e7a0d5fba92eea4f70cd' 
  AND token = 'KrQpVFNyU2Y8iZ4NpkIgvGKxSdtrS9K+7ohTOjFpFf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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