SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd664b214d1214cb8f891bedfc7aa7696aa8c503c42dffdb3962ff949db177885' 
  AND token = 'hhoKU3Y9SnglP43NXUecJXNLVoRYQBq8icrYMKwQ4DQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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