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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39683fb1c6a2e77acdf70136b9e558cfb31977543c8fba052c2c608c39c18021' 
  AND token = 'vhtZ9/1H77yAi/cfeebCIjF79qs0XqfBr6HrZ1x6S/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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