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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e5c585d0f7d267ac4efcfab3f2b35fc738cab3622ccfae0f891be6dc352104f' 
  AND token = '7uIl2n4oi9usZWYDQf1qV/XlyNwRyK0BrD0PvOM9L/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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