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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '953a51c1448f6c7f006d7e37c39b1aed25010695a4eb81c2980024a7a5369db7' 
  AND token = 'JYcfuwVwn65a3f2B/+LehmKH89e8dT4UiZRpt2I/3Z8=' 
  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"
    }
  }
}