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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17abd265a100d216dbb80b7dc33ef05d2f8fc5c19504c3d9e3e09749594661c0' 
  AND token = '5q0MOOpoKyGrhE4tsZKEGnsL6Pfe+y20RkHZinmrV/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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