Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4336b504e1f9664c0fd07a97f22faf3addc144d26f132e2a5666d4b0ccbf7bd2' 
  AND token = 'I+Zs4vJpwbREaKMDhbiLGYK1pERvXoS3YJ1ptoXdaWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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