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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '485feb315c431bd253c885581d668f487a5000ee1490b37d7f3459719b15242f' 
  AND token = 'RQgOHMFKE78OSENIr3RE9Db/pxq7UqZ6BZy999ZOnAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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