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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74b2d117791d89e267fe057a00ba8a9f360b273a279e9ccf72664d988b68a3e0' 
  AND token = 'f37GtyW7U8ZbNzDIUO3xmSvFNNhIh1fT5tIlvboORD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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