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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9724592848146c9bb5642eed02038b392dfe0c865aaa5e9a4ef33473e899522' 
  AND token = 'r8k4ezO5ly8v9dPvA9qqE31ipkdtho1GvFDbj3z71r0=' 
  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"
    }
  }
}