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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed0c6556871280a498195464216e91c8c100624bcfba0cf39f22318ffa829f37' 
  AND token = 'vPUNLhn2Bdv1hM3byvVENeCF6J0K8kW07Uni2A7eTNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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