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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c593c5e7845eda56c73708e731c084e4f3a03df21d08fc627aa2e11c63bffa6' 
  AND token = 'hQ5TemzlYwhn5F6Pf0POpjGifqOSn+Mc0vf+WS95XgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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