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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6de70c75723ed8ce1a3c96195ce798c2f18e5595b0e3d241d695e138630fc8d4' 
  AND token = 'NhxIlMzCZE3dUDCskNI/3w5ZJaXTj275cRXHb6u+iYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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