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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff8cfea5b15c411d4cf687e79085884f3e9b6ae121f9fc09d3f64ab242a7e696' 
  AND token = '2457WhQdZb5HxJxBR4EytWnGxfSC9RBmCjA+tRScNEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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