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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e620bca3b4443481821c60c8c70846b78e8d67869e090c8cc706079208a810d4' 
  AND token = 'qtxyXe6sZpLKpEyIashgo7zEH77t7LlX4GCsQF4uNwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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