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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c5b998e198b21773c34fed2159fd18493d9e5e39ac42529a785f21b81ae7827' 
  AND token = '9SyKBeQZP7tPjdYZ9BZg3l9Ma/pVqc4gIvdxdoureKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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