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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3610cb00fad58154cae97d5f3543f282aba57b771c8ec400f28911f078b9895f' 
  AND token = 'UqdTyG/RvtlqEfTsFiRkwSlsseTSBg538LfdldBlZ4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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