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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38cf0c45c04627dba18cda3cc816e8746c4cdd43ec77e5ffd21e65c0a38451b0' 
  AND token = 'QwvvqvVe4b0ByH9b+7h1WSCt7lA+6cgxNVh/sNCzmRQ=' 
  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"
    }
  }
}