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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ce8de307908264b23730b5b4cf6ffa3b2361060f55229b59cf7da526010d74a' 
  AND token = 'zfRJqn/oE7u/MO25S+bxvXjvKxiT4+PMqvsNP371ozQ=' 
  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"
    }
  }
}