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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8286d18e5f2a17c6e0d324074454883d59043d167aaca1a803aee8b5b6711ae4' 
  AND token = 'VaTqw7h/I/hYkg/yPUWfn4ABVq/hsIXES9DFYo6SsVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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