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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02858e81f8d64e679ca790d47d05fd10aa5e1a2c418e12f974ce2f4a0cb8c9c6' 
  AND token = 'NjOfnUWZ7xOjhrDbGCjomH5OrBv7aVKImD3ssfPbbK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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