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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '272de4420738ed6a9a665ec87e0fb06817a6a2fe214a74f8c732a77d77c5a1e2' 
  AND token = '+R9324t2vr+m429Mfv56MJk5jZ5R6TebrzOgVCS3JUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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