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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f59f1699f91c77aaff3bda70e0319c0667951cc04bc849ff8bd7ee1bdc631e30' 
  AND token = '1Y2sIvm0t6jZMcJqEaiH7nHy+4yYXaPpm9OpaZ8Vco8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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