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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7acda695489e301a3762001990f7406fe880eb3b8195da29308e43be2655a2ed' 
  AND token = 'EH9Nfea5Uhkhmnwf0/S+KFq8VW2GqYiw6xDP7iqGOqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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