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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0426882ddd4120344b67f70d85689368af91b09ff73e440777db79e4dd58e182' 
  AND token = '5NpHVg3ABfFT3x0kyBX9nuoA9KLpF7K0UWkWaErWPwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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