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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71df4e9b03e5696f3b84eccc68c047567ad3ca0d02ce517a54db251ced749600' 
  AND token = 'nZhIhX5X+DJjJBdQr0xVEzsXcbtmgHspjfs2TK8GIX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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