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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47df3a0ab6d76c2b20f0020067a2fdb4742767a07ce55564c0295e5f0d6aa1e3' 
  AND token = '01C2M128lHUDlCQ2Gwlf3l86lzwR5nrrLcB5sM2PmQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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