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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7473361ad28f44d0b4968ca081d12b30ea7878103873d930b1456619e919c6b' 
  AND token = '5L8z/6WvswW7OuTq7oyGORRjkS3VJdNLFB3M59TqTsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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