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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa8c9f25c4dc3e7edcb554600b7e8fbce970382bd9e1c2481ac8954732977f1d' 
  AND token = 'y/poBk2IamR23gLrsAUeZ/bRkFKVIn5uZ7Qq5mMg5bU=' 
  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"
    }
  }
}