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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f56a785356ac6271da08393fb58adb365a6d6d6e416ae792a93466ecb109c58' 
  AND token = 'Swgbrc6JWtk6lU59bjHSlQKGwFBbFTLyraSa029xFy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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