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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de6eb49f1500793a2b7847ddbee8c00988b8753c41ace72231e3bcc0767a85ae' 
  AND token = 'iUybnFuvP551tD+nCpSY6I/mF8Yi8gs/oH03+YbFbWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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