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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00cd308e9c9e9c53336f8557749f3f39d0a1cf1f742b3a28357454ab6017f610' 
  AND token = 'wDz+eJOygXcQKvT3tq4zU2ssbs7c73c8p77uq0k16EI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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