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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcc38c3380993650e3b6fbb53d6cc019a63847d56a853a7892ad0542c89f65fe' 
  AND token = 'NYUFr3Z4Q/IJDru0HPxyfZwYpshuFDcMJko7b93C/X0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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