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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46a9b871103a308c43da9f0d39dc14f8bf9fd0d92561db6da8ccb908cf276437' 
  AND token = 'pf8TYMf6RaOBLLy49RUJJpL/i96HP/iYtzXxNoMSGbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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