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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8282a2d3908fbd4b46a8156e796bf1a8c4d8395210127c0c7ce51712e7055273' 
  AND token = 'aXBQd67QGZDUZzWy7+JTkgskJByi8H9RxACopI6qcr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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