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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '061dbe7f32ea82a15557fa1d985a3e1e039e0c48734cf41202c5fe77c7e1b700' 
  AND token = 'rftceRlsrB37Y7D7Po+GcYxsQfLzXdVhBVzPwFPXZIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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