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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62944f6a8ea5dba9584f7d53b80a197e9b1cc19795ed05002dcc85b6d8daf096' 
  AND token = 'kPCLa1CX/wqCMo+7ysdzuLqe0lcFQnlxVS6OazBtsio=' 
  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"
    }
  }
}