Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41865e3ff1cbd1c8ce91d5106463683d961a9b930e2fdd00f464794976d36f04' 
  AND token = 'y+NPbRZpFBGx0QPpbNHCsvd66BaC3FI+qbCZXKWORIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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