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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9c24243724aa5e04bae62138b20126b7c6b23c67085cd30a8332ba119f740a8' 
  AND token = 'DLgo4EOsCZhZA7fR+72wV3wrB8rB6FWfu+IvVNEujC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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