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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb13204df3ff52e8748b628f18313ff4b02c29da5986bb32fad51952ad25b249' 
  AND token = '/xxvSdKcLK2Br2ZDDoywszvl6CqCcX15nCCdnDuCqJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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