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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab6ec7d228a5e50970cf656d5fe5866f479ff52819b62ae556bfe43c959ad487' 
  AND token = 'q+lfkVvyUcXujyqEswQdVbbq6ajHTs12nFqlmZpZfUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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