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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b857e5f41ee72cae292a7108e8faa0a56732f4a2ca887c028a53a4d12b02c1cf' 
  AND token = '0E0fFYxfTp9cuJs6Dgb7Wh9azVpzgULjg0f7PsSa4EE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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