Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '976f0113a2006fb91e5a6e134f7745945616bc10b4ea0fabb12fbb226843648b' 
  AND token = '9viV6/TB16Bph0/362NCV/BvenJiZsPIFgYh8JtM2cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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