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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ec66809528561fe8f8f65fce7b7c5494ca4f2b5a4850865cf4d050b613ec852' 
  AND token = '+1vV4Nj3RDgeewRUhXFPHEBYbhiDhCrbWxyMweNB29s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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