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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9a1601bf2ff15c7db535f25d788d39ee0c0e947ed42145425f3d1d946cc40f4' 
  AND token = 'GvesUUzHhCBdzvkuxkVaGt5ifTa4OD5LryPNDKr42m8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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