Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '876c44f7e276f65f13df84614abbd42ceda856878002ae4e710c7db02412c977' 
  AND token = 'jKfNVeFCI5TLVHClpjPywsgbFqbeTKzNYR+gO0m1c64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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