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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f28bdae0c7b2e2ad490b4557906d4bb158a8dbfa1c2b974766cbe8190f0ddb0' 
  AND token = 'NfCos63jN4v8wZ0PdSbQUTcTswdtth6zt7MdY+b3F9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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