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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17bd7989f6efaf2cfe7e8be6e8976c38b266f10fd0e6a7b5d2f1848a01f90dc7' 
  AND token = 'L41PDfh8erLum1gRHcSxhQkp2pe8iVSJxiS6mdxH5ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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