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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f875555c97b7936a1b91c865dd202b5da52330346730c7618b94bad46f875890' 
  AND token = 'v3dp30kADmci4OYYiOgKaWQhPROOjC5CnL9jCUEVWRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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