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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1f43bd3d294dba0f2d00e9d4cd548456cfeef28f3b069d8e3c929797df06f8c' 
  AND token = 'l6jFtK2WBDiKXmPuA+I5t8bTWTRKLfoagdtrgyB3S68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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