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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '948c70dd4a5da34540ef50b6a306eaf900dc11ba13feb5e8b79fc5ca6af588b4' 
  AND token = 'xsyU/rFnb++wCpgjvpK40DwW6JC6QURKSdZPAhkkPpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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