Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc40836e2d1648613928ca9c7755a7727d9bb3b578246ee4850bac550b0e0ade' 
  AND token = 'b1s9/oec7Pt1+Y4UCFu5g4mnlcAyGmdEroH/VEtpi74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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