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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd64179f83338a658188fe1ac22d42dca4c444238d829018d97e5bb5ec554879a' 
  AND token = '3tTlU3gSRSjL4ox1lrR+fa8RKIVKanIgSz5j0Sd0FQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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