Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1905a83972f2580da19456649f622abd075dfd25033402f4b337fe0932c91e69' 
  AND token = 'empmGH89gBtQMd++WWwZVsGhN5CAO2AQ1yf2CNDCHWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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