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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b2e4d6ee4909002e866150f499198f62817a872f65e0ed9438d02d1ce89eda7' 
  AND token = '5HmutzLTwfmzC+AJyBWoYD8AVtwNIscl3U8W/w8JMm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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