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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe75009e8a2e7f16b87ac2598c8c3af7e3b4636c33260187b1a58042215f22d0' 
  AND token = '3ulFjzGLbgsSOSOi5r/2lVzomoWEkK3n740JBrNQ5uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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