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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43bf9f4ac0614dc85b8cda54370fff42ece26a974fcee3a0989bc6da5fead4e4' 
  AND token = 'KPnqa0QXT3EyhJ6au8jOO2tYqFzNimgm+lI4NCmf24s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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