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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f8eb150de3df88a0eab1f68eac37ec72b1873019962c140822af7d3b6c2f4a7' 
  AND token = 'ERtpFkFLaYpQsSo1GMOPRb22M9wsWWcvrN31NdiBpgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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