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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68a6082ba9722c680a1c7c7b9c7c9110840b815a24aa8123e94dafbfa0a95316' 
  AND token = 'Hgp8JL4hnxYpo75P1TDA+FusqyTJcfFVbFGX82RsF6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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