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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f628a4943ebaa954ad1c76d93f080e237a4c206a265b02bd2b386e2e2d23dac' 
  AND token = 'fRgmF3mTU2lLWh87H/4muv16sH/X779MNtXBu+FuO7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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