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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8d2c63151e20f36dc6d9f39b0b6d6d07f5ffeb3002cba12b8aa54f160a890d8' 
  AND token = '57UStMOKRJIaLxEoPRcf/QeiwR7KA5/D7ijoL7coTJ0=' 
  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"
    }
  }
}