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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61499b4e6f489eb4274cfd12f801b691cb00c68a42186b1c4a68b6d7563c5ac7' 
  AND token = 'zrK+U3i6heYV8ZHdLiJ9WhjaAGc9iIoO59DJ7ozmebs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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