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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2ab88d32a9e4fb3afdb0ac4be61598cfc7e31a433cc7b4b8aaf3a8e58c651ff' 
  AND token = 'XIIHyMGzX/852FfpLLr3b7uvfKpsLFjMnIWrOrRsTcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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