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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61417b343817a7822195eb46dcf305ad1d5a1034da2ed55ea8195ea9cb4f9c65' 
  AND token = 'EKEWAQ0r9171frsXxJyl+OnDfHrnblV9hkwJkxmYE54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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