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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eedf94786f330b1e3c6dbb7192f8c58c48bd23c531089a42dae0f3c628d5b1c' 
  AND token = 'w4Hhc6/JbQ0iIkEB7K2lAUsdGHqE/89SWLVuOseBZSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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