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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cb9069023a0b47b5e5afdce5f99d2ad30a6fd7f29f8fc22d57f6218d908cb26' 
  AND token = 'JnPJp2VzczQG3G6ScD+xBXxi5zKcw9X71l02PjOslxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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